Modbus TCP, Modbus UDP and Modbus RTU client/server library for .NET
Industry approved!!
Fast and secure access from PC or Embedded Systems to many PLC-Systems and other components for industry automation.
Only a few lines of codes are needed to read or write data from or to a PLC.

Additional Software tools e.g. Modbus Server Simulator, makes software development fast and easy.

Download Library (*.DLL) and tools:

For JAVA-Version see: https://sourceforge.net/projects/easymodbustcp-udp-java/

Now available: Modbus RTU Slave for ATMEL ATMEGA microcontrollers

See Also CRC-Checking Tool for RTU Frames: http://easymodbustcp.net/crc-calculation

Supports Function Codes:

• Read Coils (FC1)
• Read Discrete Inputs (FC2)
• Read Holding Registers (FC3)
• Read Input Registers (FC4)
• Write Single Coil (FC5)
• Write Single Register (FC6)
• Write Multiple Coils (FC15)
• Write Multiple Registers (FC16)

Modbus TCP, Modbus UDP and Modbus RTU client/server library

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.